Measurement method for spatial distribution of deuterium or tritium detained on surface of first Tokamak wall

Abstract

The invention discloses a measurement method for the two-dimensional distribution of deuterium or tritium detained on surface of a first Tokamak wall material, which is used for studying retention characteristics of deuterium (tritium) elements on the surface of the first wall material of a magnetic confinement fusion device so as to obtain the two-dimensional distribution of the deuterium (tritium) elements in a tiny area on the surface of the wall material. The measurement method is characterized in that: two high-power tunable pulse laser beams are respectively used for disaggregating chemical bonds (desorption) of C-H and C-D through resonance and for ionizing H atoms and D atoms through resonance to effectively produce H<+> ions and D<+> ions, and deuterium (tritium) ions are detected by using the mass spectrum of the time of flight. A microscope / camera system is used for observing a detected sample area, and the two-dimension analysis of samples is realized through a precise two-dimensional electric platform; moreover, when the measurement method is adopted, the distribution condition of the deuterium (hydrogen, tritium) elements on the surface of the first wall material canbe effectively measured at a high speed with high sensitivity and high resolution, and a basis is provided for the detailed study of the surface retention characteristics of the deuterium (tritium).

Description

technical field [0001] The present invention relates to techniques for diagnosing deuterium (tritium) retention properties on the surface of a first wall material (graphite or carbon fiber) in a magnetic confinement fusion device. Background technique [0002] Fusion energy is a kind of clean energy, and it is also the fundamental way to solve the human energy crisis. The interaction between the plasma of the magnetic confinement fusion device (tokamak) and the first wall material is one of the key issues in the controlled magnetic confinement fusion technology. Under plasma irradiation on the surface of the first wall material, complex phenomena such as physical sputtering, chemical corrosion, structural damage, and deuterium (tritium) retention will occur. Due to its low atomic number, high melting point (4043°C), good thermal conductivity, and small neutron absorption cross section, graphite (or carbon fiber) can still maintain its mechanical strength at high temperature...

AI Technical Summary

Problems solved by technology

In the process of non-resonant laser ablation, the excitation of atoms and the ionization of atoms are not selective, which is closely related to the energy of photons. Therefore, the plasma generated under this condition is dominated by thermal effects, while ions in laser ablation The proportion of the generated plasma is very small, and the ionization efficiency is low (10 -2 -10 -3 ), and there are serious matrix effects, so the detection sensitivity and spatial resolution are low

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